Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial Assets:
Interest Bearing Time Deposits with Banks	$ 747	$ 745
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,574,341)	(4,744,316)
Time Deposits	(438,194)	(347,099)
Carrying Value
Financial Assets:
Cash and Short-term Investments	373,046	396,890
Interest Bearing Time Deposits with Banks	747	745
Loans, Net	3,619,378	2,960,728
Accrued Interest Receivable	24,907	20,229
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,136,147)	(4,397,217)
Time Deposits	(438,194)	(347,099)
Short-term Borrowings	(43,455)	(68,328)
Long-term Debt	(102,540)	(83,855)
Accrued Interest Payable	(1,333)	(613)
Estimate of Fair Value Measurement
Financial Assets:
Cash and Short-term Investments	373,046	396,890
Interest Bearing Time Deposits with Banks	747	745
Loans, Net	3,576,028	2,980,555
Accrued Interest Receivable	24,907	20,229
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,136,147)	(4,397,217)
Time Deposits	(436,837)	(347,876)
Short-term Borrowings	(43,455)	(68,328)
Long-term Debt	(98,912)	(86,623)
Accrued Interest Payable	(1,333)	(613)
Estimate of Fair Value Measurement | Level 1
Financial Assets:
Cash and Short-term Investments	70,660	47,173
Interest Bearing Time Deposits with Banks	0	0
Loans, Net	0	0
Accrued Interest Receivable	0	0
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,136,147)	(4,397,217)
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	0	0
Accrued Interest Payable	0	0
Estimate of Fair Value Measurement | Level 2
Financial Assets:
Cash and Short-term Investments	302,386	349,717
Interest Bearing Time Deposits with Banks	747	745
Loans, Net	0	0
Accrued Interest Receivable	10,849	9,213
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(436,837)	(347,876)
Short-term Borrowings	(43,455)	(68,328)
Long-term Debt	(26,823)	(28,320)
Accrued Interest Payable	(1,105)	(579)
Estimate of Fair Value Measurement | Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Interest Bearing Time Deposits with Banks	0	0
Loans, Net	3,576,028	2,980,555
Accrued Interest Receivable	14,058	11,016
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(72,089)	(58,303)
Accrued Interest Payable	$ (228)	$ (34)